题目内容

He _____the problem _____in his mind for a whole week before he did anything about it.
A．switched; onB．kicked; upC．turned; overD．took; on
C
句意：在采取措施之前，他在脑中将这个问题反复思考了一个星期。turn over :to think about carefully仔细考虑；switch on把开关打开；kick up引起；take on呈现、雇用、承担。
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